1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
4 *
5 * Based on the Linux implementation.
6 * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
7 * Authors: Carsten Langgaard <carstenl@mips.com>
8 * Maciej W. Rozycki <macro@mips.com>
9 */
10
11 #include <common.h>
12 #include <gt64120.h>
13 #include <pci.h>
14 #include <pci_gt64120.h>
15
16 #include <asm/io.h>
17
18 #define PCI_ACCESS_READ 0
19 #define PCI_ACCESS_WRITE 1
20
21 struct gt64120_regs {
22 u8 unused_000[0xc18];
23 u32 intrcause;
24 u8 unused_c1c[0x0dc];
25 u32 pci0_cfgaddr;
26 u32 pci0_cfgdata;
27 };
28
29 struct gt64120_pci_controller {
30 struct pci_controller hose;
31 struct gt64120_regs *regs;
32 };
33
34 static inline struct gt64120_pci_controller *
hose_to_gt64120(struct pci_controller * hose)35 hose_to_gt64120(struct pci_controller *hose)
36 {
37 return container_of(hose, struct gt64120_pci_controller, hose);
38 }
39
40 #define GT_INTRCAUSE_ABORT_BITS \
41 (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)
42
gt_config_access(struct gt64120_pci_controller * gt,unsigned char access_type,pci_dev_t bdf,int where,u32 * data)43 static int gt_config_access(struct gt64120_pci_controller *gt,
44 unsigned char access_type, pci_dev_t bdf,
45 int where, u32 *data)
46 {
47 unsigned int bus = PCI_BUS(bdf);
48 unsigned int dev = PCI_DEV(bdf);
49 unsigned int devfn = PCI_DEV(bdf) << 3 | PCI_FUNC(bdf);
50 u32 intr;
51 u32 addr;
52 u32 val;
53
54 if (bus == 0 && dev >= 31) {
55 /* Because of a bug in the galileo (for slot 31). */
56 return -1;
57 }
58
59 if (access_type == PCI_ACCESS_WRITE)
60 debug("PCI WR %02x:%02x.%x reg:%02d data:%08x\n",
61 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
62
63 /* Clear cause register bits */
64 writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause);
65
66 addr = GT_PCI0_CFGADDR_CONFIGEN_BIT;
67 addr |= bus << GT_PCI0_CFGADDR_BUSNUM_SHF;
68 addr |= devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF;
69 addr |= (where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF;
70
71 /* Setup address */
72 writel(addr, >->regs->pci0_cfgaddr);
73
74 if (access_type == PCI_ACCESS_WRITE) {
75 if (bus == 0 && dev == 0) {
76 /*
77 * The Galileo system controller is acting
78 * differently than other devices.
79 */
80 val = *data;
81 } else {
82 val = cpu_to_le32(*data);
83 }
84
85 writel(val, >->regs->pci0_cfgdata);
86 } else {
87 val = readl(>->regs->pci0_cfgdata);
88
89 if (bus == 0 && dev == 0) {
90 /*
91 * The Galileo system controller is acting
92 * differently than other devices.
93 */
94 *data = val;
95 } else {
96 *data = le32_to_cpu(val);
97 }
98 }
99
100 /* Check for master or target abort */
101 intr = readl(>->regs->intrcause);
102 if (intr & GT_INTRCAUSE_ABORT_BITS) {
103 /* Error occurred, clear abort bits */
104 writel(~GT_INTRCAUSE_ABORT_BITS, >->regs->intrcause);
105 return -1;
106 }
107
108 if (access_type == PCI_ACCESS_READ)
109 debug("PCI RD %02x:%02x.%x reg:%02d data:%08x\n",
110 PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), where, *data);
111
112 return 0;
113 }
114
gt_read_config_dword(struct pci_controller * hose,pci_dev_t dev,int where,u32 * value)115 static int gt_read_config_dword(struct pci_controller *hose, pci_dev_t dev,
116 int where, u32 *value)
117 {
118 struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
119
120 *value = 0xffffffff;
121 return gt_config_access(gt, PCI_ACCESS_READ, dev, where, value);
122 }
123
gt_write_config_dword(struct pci_controller * hose,pci_dev_t dev,int where,u32 value)124 static int gt_write_config_dword(struct pci_controller *hose, pci_dev_t dev,
125 int where, u32 value)
126 {
127 struct gt64120_pci_controller *gt = hose_to_gt64120(hose);
128 u32 data = value;
129
130 return gt_config_access(gt, PCI_ACCESS_WRITE, dev, where, &data);
131 }
132
gt64120_pci_init(void * regs,unsigned long sys_bus,unsigned long sys_phys,unsigned long sys_size,unsigned long mem_bus,unsigned long mem_phys,unsigned long mem_size,unsigned long io_bus,unsigned long io_phys,unsigned long io_size)133 void gt64120_pci_init(void *regs, unsigned long sys_bus, unsigned long sys_phys,
134 unsigned long sys_size, unsigned long mem_bus,
135 unsigned long mem_phys, unsigned long mem_size,
136 unsigned long io_bus, unsigned long io_phys,
137 unsigned long io_size)
138 {
139 static struct gt64120_pci_controller global_gt;
140 struct gt64120_pci_controller *gt;
141 struct pci_controller *hose;
142
143 gt = &global_gt;
144 gt->regs = regs;
145
146 hose = >->hose;
147
148 hose->first_busno = 0;
149 hose->last_busno = 0;
150
151 /* System memory space */
152 pci_set_region(&hose->regions[0], sys_bus, sys_phys, sys_size,
153 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
154
155 /* PCI memory space */
156 pci_set_region(&hose->regions[1], mem_bus, mem_phys, mem_size,
157 PCI_REGION_MEM);
158
159 /* PCI I/O space */
160 pci_set_region(&hose->regions[2], io_bus, io_phys, io_size,
161 PCI_REGION_IO);
162
163 hose->region_count = 3;
164
165 pci_set_ops(hose,
166 pci_hose_read_config_byte_via_dword,
167 pci_hose_read_config_word_via_dword,
168 gt_read_config_dword,
169 pci_hose_write_config_byte_via_dword,
170 pci_hose_write_config_word_via_dword,
171 gt_write_config_dword);
172
173 pci_register_hose(hose);
174 hose->last_busno = pci_hose_scan(hose);
175 }
176